Model is a sucker for kids (5)
I believe the answer is:
dummy
'model' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dummy that I've seen before include "Bridge hand on table" , "Hand played by declarer" , "who lays his cards on the table?" , "Baby's comforter" , "that all the players can see" .)